Make SVGLengthMode an enum class

Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 53 matching lines @@
         );
 
     EXPECT_EQ(
         ::std::string("AnimatableColor(rgba(0, 0, 0, 0), #ff0000)"),
         PrintToString(AnimatableColor::create(Color(0x000000FF), Color(0xFFFF0000))));
 
     EXPECT_THAT(
         PrintToString(const_cast<AnimatableValue*>(AnimatableValue::neutralValue())),
         testing::StartsWith("AnimatableNeutral@"));
 
-    RefPtrWillBeRawPtr<SVGLength> length1cm = SVGLength::create(LengthModeOther);
-    RefPtrWillBeRawPtr<SVGLength> length2cm = SVGLength::create(LengthModeOther);
+    RefPtrWillBeRawPtr<SVGLength> length1cm = SVGLength::create();
+    RefPtrWillBeRawPtr<SVGLength> length2cm = SVGLength::create();
     length1cm->setValueAsString("1cm", ASSERT_NO_EXCEPTION);
     length2cm->setValueAsString("2cm", ASSERT_NO_EXCEPTION);
 
     EXPECT_EQ(
         ::std::string("AnimatableSVGLength(1cm)"),
         PrintToString(AnimatableSVGLength::create(length1cm)));
 
     EXPECT_THAT(
         PrintToString(AnimatableShapeValue::create(ShapeValue::createShapeValue(BasicShapeCircle::create().get(), ContentBox).get())),
         testing::StartsWith("AnimatableShapeValue@"));
@@ skipping 20 matching lines @@
     EXPECT_EQ(
         ::std::string("AnimatableUnknown(none)"),
         PrintToString(AnimatableUnknown::create(CSSPrimitiveValue::createIdentifier(CSSValueNone).get())));
 
     EXPECT_EQ(
         ::std::string("AnimatableVisibility(VISIBLE)"),
         PrintToString(AnimatableVisibility::create(VISIBLE)));
 }
 
 } // namespace